Add Developer Certificate of Origin Text

We purposely chose to license Docker under the Apache 2.0 license. This is a well-known
license, which is popular for its permissive and flexible properties, while still
encouraging a collaborative community. It also makes certain representations with regard
to contributions, and the rights given to contributors, the project, people who use Docker,
people who modify Docker, etc.

This approach to contributions is inspired by the popular Linux Developer
"Certificate of Origin". This approach makes it simple for new contributors to get started,
and avoids bureaucracy in tracking contributions and contributors.

To indicate accordance, each individual contribution to the Project is signed off by the
developer, using his or her real name, email address, and github handle in the format below:

	Docker-DCO-1.0-Signed-off-by: Joe Smith <joe.smith@email.com>
fix docker run on an unknown image
fix -link parsing
Increase max image depth to 127
Search for repo first before image id
Add udev rules files for hiding the docker loopback devices from udisks

This prevents them from showing up on the desktop in a window manager, for example.
Remove mkimage-centos.sh in favor of a new rinse-based script, since febootstrap is fragile and picky
Update bundlescript shebangs to be bash, reflecting how they're actually invoked
Add cgroup-bin dependency to our Ubuntu package

Since cgroup-bin is only "recommended" by the lxc package on Ubuntu, but is necessary for having the proper cgroups mounted for Docker to function, this makes some sense for us to add separately.

Fixes #2990
add an example of docker ps, and also of link aliases
Instructions on how to install Docker on Red Hat Enterprise Linux / CentOS.
Add a proposal step for potential MAINTAINERS.

Fixes #3014
Added note about Ubuntu curl installation
- Updated the doc with the current implementation status
initial stab at writing a use/ambassador-pattern howto (Issue #2485)
Merged with master
Move test cpu shares out of test start

Fixes #2107
Add Sven Dowideit to docs maintainers
I was reading the doc, and noticed that some examples didnt use $ sudo docker, so this makes it a little more consistent
add a little prose to tell the user that run creates a container, and then starts it